JPH02203095A - Pipe fittings and pipe repair parts - Google Patents

Abstract

PURPOSE:To surely connect a pipe from the inside by inserting into an end of the pipe to be connected a pipe joint spread in its contour, in case of the cylindrical pipe joint made by a shape memory alloy having two or more annular protrusions in the peripheral surface. CONSTITUTION:In the case of a pipe joint 10 by a shape memory alloy, the pipe joint 10 is constituted of the cylindrical shape memory alloy forming two or more annular protrusions 11 in the peripheral surface. The pipe joint 10 is inserted into both ends of pipes 1 to be connected, and by heating to not less than a transition temperature the pipe joint 10 spreading its contour and biting in an internal wall of the pipes 1 to be connected, the pipes 1, 1 are connected by generating seal performance for a fluid pressure and extraction resisting force in a pipe axial direction. As the result, even in the case of execution unable with the pipe joint or the like arranged outside the pipe, the execution can be performed with no problem.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pipe joint and a pipe repair member made of a shape memory alloy that are inserted into the inside of a pipe.

[Prior art] As a pipe joint made of shape memory alloy, Japanese Patent Publication No. 54-484
There is No. 8. This is achieved by inserting the ends of the pipes to be connected into a cylindrical joint member from both sides and heating the joint member above the transition temperature to tightly fit the joint member to the ends of the pipes to be connected. It is something that makes you

[Question 8 to be solved] The above-mentioned conventional pipe joint made of a shape memory alloy is one into which both ends of the pipe are inserted, that is, it is provided on the outside of the pipe.

However, there are cases where it is not possible to install a joint member on the outside of the pipe to be connected, and there has been no conventional method that can meet this request.

An object of the present invention is to provide a pipe joint and a pipe repair member that can meet the above requirements.

[Means for Solving the Problems] The pipe joint of the present invention is a cylindrical pipe joint made of a shape memory alloy with a plurality of annular protrusions formed on the outer circumferential surface, and is inserted into both ends of pipes to be connected. The pipes are connected by expanding the diameter.

In addition, the pipe repair member is a repair member having the same configuration as the above-mentioned pipe joint, which is inserted into the repaired portion of the pipe, and is expanded in diameter to repair the pipe from the inner surface.

In addition, the diameter of the liner material inserted at both ends of the pipe or into the pipe is expanded using a driver made of a shape memory alloy to connect or repair the pipe.

[Function] The pipe joint and pipe repair member of the present invention are inserted into the inside of the pipe, and none are disposed outside the pipe. Therefore, even if a pipe joint or the like cannot be installed on the outside of the pipe, the construction can be carried out without any problem.

[Example] Hereinafter, one example of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, 10 is a cylindrical pipe joint made of a shape memory alloy.
A plurality of annular protrusions 11 are formed on the outer peripheral surface. In this example, two annular protrusions 11 are formed symmetrically from the center. Both ends 10a of the joint gradually become thinner toward the tip.

After assembling (heating and expanding the diameter of the pipe joint 10) (Fig. 3), a cylindrical material with the outside diameter of the joint (the outside diameter of the annular protrusion 11) that allows sufficient bonding between the pipe 1 to be connected and the joint 10 is obtained. Then, the diameter is reduced to a size that can secure the gap necessary for assembly with the pipe 1 (Fig. 2), and the final finishing is performed in that state.

Then, as shown in FIG. 2, the joint 10 is inserted into the connecting pipe end of the connected pipe 1.1 so that the center of the joint 10 is located at the connecting part. In this state, the diameter of the joint is expanded by heating it above the transition temperature. As a result, as shown in FIG. 3, the annular projection 11 of the joint bites into the inner wall of the connected pipe 1.
The tubes 1.1 are connected so as to provide a seal against the fluid pressure and a pull-out force in the tube axis direction.

Next, an example of use as a pipe repair member will be explained with reference to FIGS. 4 and 5.

The pipe repair member 20 has a similar configuration to the pipe joint 10 of the above example. Then, this repair member 2° is processed in the same manner as above to repair the pipe 2 having the flaw 3. 'IIi Insert into the repaired part position and enlarge the diameter in the same way as above.

In this way, by making the annular protrusion 21 bite into the inner wall of the tube 2, the tube 2 can be repaired from the inside.

Note that the tube can also be reinforced from the inside by inserting it into the portion of the tube 2 that requires reinforcement and expanding the diameter in the same manner as described above.

Next, the pipe connector will be explained with reference to FIG.

This connector is composed of a cylindrical liner material 31 and a cylindrical driver 30 made of a shape memory alloy that is pushed into the inside of the liner material and expands the diameter of the liner material.

A plurality of annular projections 3 are provided on the outer peripheral surface of the cylindrical liner material 31.
2 is formed. In this example, two annular protrusions 32 are formed symmetrically from the center of the liner material. The dimensions are such that it can be inserted into both ends of the pipe to be connected 1.1. On the other hand, in the cylindrical driver 30, the outer diameter of the material that will bring the liner material 31 into close contact with the inner surface of ¥t1 after being heated and expanded is reduced in diameter to a size that can be inserted into the liner material 31, and the final finishing process is performed in that state. is being done.

Then, the liner material 31 is inserted into both ends of the pipe 1.1 to be connected, and the driver 30 is inserted into this and the diameter of the driver is expanded, so that the annular protrusion 32 of the liner material is inserted into the pipe 1. The tubes 1.1 can be connected to each other by cutting into the inner wall.

Moreover, the pipe repair tool can be configured in the same manner as described above, and the pipe can be repaired and reinforced from the inside.

In these cases, the liner material used is the same material or type as the pipe to be connected or repaired.

These pipe connectors and pipe repair tools are suitably used in cases where corrosion due to battery action is likely to occur between the shape memory alloy and the pipe to be connected or repaired. It is also used in cases where it is difficult to form annular protrusions on the shape memory alloy itself.

[Effects of the Invention] The pipe joint and pipe repair member of the present invention are as described above, and the pipe joint and pipe repair member are those that are inserted into the inside of the pipe, and those that are arranged on the outside of the pipe. There is no. Therefore, even if a pipe joint or the like cannot be installed on the outside of the pipe, the construction can be carried out without any problem.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the pipe joint of the present invention, and FIG.
Figures 3 and 3 are explanatory diagrams showing the procedure for connecting pipes, Figure 4 is a cross-sectional view of a pipe to be repaired, Figure 5 is a cross-sectional view showing an example of a pipe repair member, and Figure 6 is a cross-sectional view of a pipe to be repaired. It is an explanatory view of a state where pipes are connected. 10... Pipe joint 11, 21, 31... Annular projection 2
0... Pipe repair member 30... Driver 31...
・Liner material.

Claims (1)

[Scope of Claims] 1) A cylindrical pipe joint made of a shape memory alloy with a plurality of annular protrusions formed on the outer circumferential surface, which is inserted into both ends of the pipes to be connected and expanded in diameter to connect the pipes. Pipe fittings to connect. 2) A cylindrical pipe repair member made of a shape memory alloy with a plurality of annular protrusions formed on the outer circumferential surface, which is inserted into the repair area of the pipe to be repaired and repairs the pipe by expanding its diameter. . 3) A cylindrical liner material inserted into both ends of the pipes to be connected, with a plurality of annular protrusions formed on the outer circumferential surface, and a shape memory alloy inserted inside the liner material. A pipe connector consisting of a cylindrical driver that expands the diameter of the liner material. 4) A cylindrical liner material that is inserted into the repaired portion of the pipe to be repaired and has a plurality of annular protrusions formed on its outer circumferential surface, and a cylinder made of a shape memory alloy that is inserted inside the liner material. A pipe repair tool consisting of a shaped screwdriver for expanding the diameter of the liner material.